Apache Module mod_proxy_http

Summary

This module requires the service of mod_proxy. It provides the features used for
proxying HTTP requests. mod_proxy_http
supports HTTP/0.9, HTTP/1.0 and HTTP/1.1. It does not
provide any caching abilities. If you want to set up a caching
proxy, you might want to use the additional service of the
mod_cache module.

Thus, in order to get the ability of handling HTTP proxy requests,
mod_proxy and mod_proxy_http
have to be present in the server.

Warning

Do not enable proxying until you have secured your server. Open proxy
servers are dangerous both to your network and to the Internet at
large.